Put-Call Ratio (Volume) (30-Day)

Put-Call Ratio (Volume): The ratio of puts traded to calls traded, for options with the relevant expiration date.

Prothena Corporation plc (PRTA) had 30-Day Put-Call Ratio (Volume) of 0.9905 for 2025-10-13.

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Figures for 2025-10-13

Volatility Metrics
Historical Volatility (Close-to-Close)	0.4554
Historical Volatility (Parkinson)	0.4724
Implied Volatility (Calls)	0.8815
Implied Volatility (Puts)	0.8490
Implied Volatility (Mean)	0.8653
Put-Call Implied Volatility Ratio	0.9631
Implied Volatility Skew	0.2447
Option Statistics
Put-Call Ratio (Volume)	0.9905
Put-Call Ratio (Open Interest)	1.9927